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Solid-phase synthesis of a branched hexasaccharide using a highly efficient synthetic strategy
F Roussel1, M Takhi, R R Schmidt
1Fachbereich Chemie, Universität Konstanz, Fach M 725, D-78457 Konstanz, Germany.
The Journal of Organic Chemistry
|December 12, 2001
Summary
Researchers developed a new method for synthesizing branched lacto-N-neohexaose, a key human milk oligosaccharide. This novel solid-phase synthesis approach offers an efficient route to complex carbohydrate structures.
Area of Science:
- Carbohydrate Chemistry
- Organic Synthesis
- Glycoscience
Background:
- Human milk oligosaccharides (HMOs) play crucial roles in infant health.
- Complex branched HMOs like lacto-N-neohexaose are challenging to synthesize.
- Efficient synthetic routes are needed for studying HMO functions.
Purpose of the Study:
- To describe the solid-phase synthesis of a branched lacto-N-neohexaose derivative.
- To develop and utilize novel building blocks and linkers for oligosaccharide synthesis.
- To achieve high overall yield in the synthesis of the target hexasaccharide.
Main Methods:
- Solid-phase synthesis utilizing orthogonal protecting groups (Fmoc and Lev).
- Preparation of a novel lactose building block and an ester-type linker.
- Glycosylation reactions using lactosamine and glucosamine donors.
Main Results:
- Successful synthesis of a branched lacto-N-neohexaose derivative (1).
- Preparation of a new lactose building block (3) with orthogonal protecting groups.
- Achieved excellent overall yield (43%) over eight steps using two different synthetic approaches.
- Demonstrated the utility of a novel ester-type linker (2) for facile cleavage.
Conclusions:
- A robust solid-phase synthesis of branched lacto-N-neohexaose was established.
- The developed building blocks and linker facilitate efficient complex oligosaccharide assembly.
- This method provides access to valuable carbohydrate structures for further research.